Performance issue / faster response after using of same criteria once again

Since some days I have the problem that some fast queries (not changed) need now a lot of time. The response time for the same query is very different as well: sometimes only 531ms and then 15 secs.
Now i found out that when I use the same criteria (or only the column which is indicated) once again that the query runs much faster.
Does anybody has similiar experiences?
Thanks! Daniel.

I don't think that is the issue, a query that requires a 14+ second parse would be something to behold.
The difference is respnse time is likely to do with the data blocks being cached as result of the first query.

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Moderator message - Please see Please Read before Posting in the Performance and Tuning Forum before posting - post locked
Rob

Performance issue in SQL while using max

Hi
I have log table which desired changed date. if any transaction entered for the changed date and less, then the name and location should be shown based on change log table. if change log entry has two values for a same date for a customer then need to show the max value for the row.
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ID   CUSTOMER_ID                NAME        LOCATION      CHANGED_DATE
1          1                      sar          boston          11-1-13
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Hi Vincent,
In your query, you use CrossJoin in it. Crossjoin function will cause the performance issue if there are a lot of properties that need to be displayed. If you cross-join medium-sized or large-sized sets (e.g., sets that contain more than 100 items each),
you can end up with a result set that contains many thousands of items—enough to seriously impair performance. For the detail information, please see:
http://sqlmag.com/data-access/cross-join-performance
In your MDX query, ensure only retrieval the required data. Here are some useful links for your reference.
Configure memory setting:
http://social.msdn.microsoft.com/Forums/en/sqlanalysisservices/thread/bf70ca19-5845-403f-a85f-eac77c4495e6
Performance Tuning:
http://www.microsoft.com/downloads/details.aspx?FamilyID=3be0488d-e7aa-4078-a050-ae39912d2e43&displaylang=en
http://www.packtpub.com/article/query-performance-tuning-microsoft-analysis-services-part2
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Charlie Liao
TechNet Community Support

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Performance Issue - Index is not used when a zero padded string is queried

Hi All,
I have a table T1 which has many columns. One such column say C1 is a varchar2(20). T1 has 10 million rows and there is an index called I1 on C1. Stats are current for both tables and indexes. These are the scenarios:
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187 ms
Scenario 2
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Edited by: user539954 on May 14, 2009 12:22 PM
Edited by: user539954 on May 14, 2009 12:32 PM

user539954 wrote:
Please see the replies below:
- How many distinct values for C1 out of that 10 million rows? I'm guessing that histograms were created for C1, correct?
=>7 million distinct c1 values. I have not gathered a histogram yet. Should I try that?
SQL> explain plan for select * from T1 where C1 = '0000000954';
| Id | Operation         | Name           | Rows | Bytes | Cost (%CPU)|
|   0 | SELECT STATEMENT |                |   244K|    19M| 26228   (5)|
|   1 | TABLE ACCESS FULL| T1 |   244K|    19M| 26228   (5)|
SQL> explain plan for select * from T1 where C1 = '0033454555';
| Id | Operation                   | Name               | Rows | Bytes | Cost (%CPU)|
|   0 | SELECT STATEMENT            |                    |   532 | 43624 |   261   (0)|
|   1 | TABLE ACCESS BY INDEX ROWID| T1     |   532 | 43624 |   261   (0)|
|   2 |   INDEX RANGE SCAN          | I1 |   532 |       |     2   (0)|
It's possible you do have a histogram, even though you didn't plan on creating it, if you're running 10g.
In the absence of a histogram and with 7M distinct keys in 10M rows, Oracle should have predicted 2 rows for both queries, not 244,000 and 532.
If you do have a histogram, you probably need to get rid of it.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking"
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select * from ( select "COLUMN1","COLUMN2",...,"COLUMNn" from ( select * from <table> ) )
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Like Jan said,
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Hello.
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please take a look here:
[https://service.sap.com/sap/support/notes/1142664] (Look under related notes)
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Stratos

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Hi.
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please check and let me know wht this vrkpa is taking time and how can i improve the performance as from kna1,i am fetching data very easily while fetching nothing from vrkpa and fetching fkdat from vbrk.
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           WHERE vbeln = it_vrkpa-vbeln.
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Hi,
Transaction SE11
Table VRKPA => Display (not Change)
Click on "Indexes"
Click on "Create" (if your system is Basis 7.00, then click on the "Create" drop-down icon and choose "Create extension index")
Choose a name (up to 3 characterss, start with Z)
Enter a description for the index
Enter the field names of the index
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Choose "Activate"
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Rgds,
Mark

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Hi Guyz,
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FYI
itab has 2677 number of records
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Your answers will be rewarded.

It would be useful to know what business requirement this is trying to meet - it looks like you are trying to trawl through the payment run line items table for a series of document numbers, but you may already have some of this same data available from BKPF & BSEG, or at least more quickly accessible by travelling through these tables first.
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Performance issue - Index not being used

Hi,
I have the following scenario
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>> Shud I be creating a bit map index.
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Also bitmaps are very dangerous for Transactional tables. They are not meant for them.
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Performance issue / faster response after using of same criteria once again

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